Redo desktop nav, add options for site name and favicon (#83)

Reviewed-on: https://akkoma.dev/AkkomaGang/pleroma-fe/pulls/83
Co-authored-by: eris <femmediscord@gmail.com>
Co-committed-by: eris <femmediscord@gmail.com>

src/components/settings_modal/settings_modal.scss

@@ -71,5 +71,11 @@
       display: flex;
       flex-grow: 1;
     }
+
+    .logout-button {
+      position: absolute;
+      right: 20px;
+      padding-right: 10px;
+    }
   }
 }